books.google.ca - "At the apogee of ancient medical advances stood Galen (AD 129-c. AD 210), once the personal physician to the emperor Marcus Aurelius. A prolific writer, among his surviving works is what he believed to be the definitive guide to a healthy diet, based on the theory of the four humours. In these treatises...http://books.google.ca/books/about/Galen_on_Food_and_Diet.html?id=tyip3Kf68TYC&utm_source=gb-gplus-shareGalen on Food and Diet